zhangjingyu 
common.php文件中删除函数代码，把代码放在bbscode.php文件中运行：
Fatal error: Call to undefined function utf8ToNumericEntities() in /www/wwwroot/vtu425.com/5337music/5.php on line 28

添加require_once(R_P.'require/bbscode.php');调用这个文件：
Warning: require_once(R_Prequire/bbscode.php): failed to open stream: No such file or directory in /www/wwwroot/vtu425.com/5337music/5.php on line 2

Fatal error: require_once(): Failed opening required 'R_Prequire/bbscode.php' (include_path='.:/www/server/php/54/lib/php') in /www/wwwroot/vtu425.com/5337music/5.php on line 2

路径不对，修改为require_once('../require/bbscode.php');，又提示Forbidden。
看来，调试文件没有访问权限。